How is your teacher today?的回答
题目
How is your teacher today?的回答
4选一：
A.I'm fine,thank you.B.She is well,thanks.C.He is good,thanks.D.They are fine,thank you.
答案
He/she's fine,thank you!
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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